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Capital structure and financing - C.1. Share capital and other equity reserves (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract]      
Number of shares authorised 133,333,200 133,333,200  
Number of shares issued and fully paid 101,739,217 101,739,217  
Par value per share (usd per share) $ 1.5 $ 1.5  
Share capital $ 153 $ 153  
Share premium 480 482  
Share capital and premium 633 635 [1],[2]  
Disclosure of reserves within equity [line items]      
Other equity reserves [1],[2] (538)    
Share based compensation [3] 30 22 $ 22
Issuance of shares 1 2 1
Remeasurements of post-employment benefit obligations 0 0 [4] (2) [4]
Cash flow hedge reserve movement (16) (1) [4] 4 [4]
Currency translation movement (4) (81) [4] 85 [4]
Effect of restructuring in Tanzania [5] 0    
Other equity reserves (544) (538) [1],[2]  
Legal reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves 16 16 16
Other equity reserves 16 16 16
Equity settled transaction reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves 47 46 43
Share based compensation 29 22 22
Issuance of shares (25) (22) (18)
Other equity reserves 52 47 46
Hedge reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (1) 0 (4)
Cash flow hedge reserve movement (16) (1) 4
Other equity reserves (18) (1) 0
Currency translation reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (599) (531) (616)
Currency translation movement (2) (68) 85
Effect of restructuring in Tanzania 9    
Other equity reserves (593) (599) (531)
Pension obligation reserve      
Disclosure of reserves within equity [line items]      
Other equity reserves (3) (3) (1)
Remeasurements of post-employment benefit obligations     (2)
Other equity reserves (2) (3) (3)
Other reserves      
Disclosure of reserves within equity [line items]      
Other equity reserves (538) (472) (562)
Share based compensation [3],[6] 29 22 22
Issuance of shares [6] (25) (22) (18)
Remeasurements of post-employment benefit obligations     (2)
Cash flow hedge reserve movement (16) 1 4
Currency translation movement (2) (67) 85
Effect of restructuring in Tanzania [5],[6] 9    
Other equity reserves $ (544) $ (538) $ (472)
[1] Not restated for the application of IFRS 16 as the Group elected the modified retrospective approach.
[2] The consolidated statement of financial position at December 31, 2018 has been restated after finalization of the Cable Onda purchase accounting (note A.1.2.).
[3] Share-based compensation – see note C.1.
[4] Re-presented for discontinued operations (shown in note A.4.). 2018 and 2017 were not restated for the application of IFRS 16, and , additionally, 2017 was not restated for the application of IFRS 15 and IFRS 9, as the Group elected the modified retrospective approach.
[5] Effect of the restructuring in Tanzania A.1.2.
[6] Other reserves – see note C.1.